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Some of you may be familiar with the San-X line of characters called すみっコぐらし. The shtick is that they're timid and like "living (ぐらし) in the corner (すみっこ)"
I know katakana is frequently used for emphasis, but what is the wordplay intended by writing just the single syllable コ in すみっこ in katakana?
What is a "corner" shaped like? ;)
In addition to drawing your attention by being unusual, it's visually appropriate for the meaning. I'd suggest it's as much/more a graphic design choice than any linguistic emphasis.
To me, すみっコ looks cuter and tinier than すみっこ.
Similarly, はしっコ、ちびっコ、ひよっコ、いたずらっコ look a bit cuter, more casual/friendly, less serious and/or more playful than 端っこ/はしっこ、ちびっ子/ちびっこ、ひよっ子/ひよっこ、いたずらっ子/いたずらっこ, don't you think?
First of all, saying 隅っこ versus just 隅 is something of a colloquialism to begin with. And writing it with a コ instead of こ seems like a stylistic choice by a marketing team who is trying to be as cute as possible.
Look at how katakana is used in advertising and you will find many examples of how something normally written in hiragana/kanji has been switched out for katakana. This is often a marketing strategy used to make the text more eye-catching.
